Electric grinding device.



UNITED STATES PATENT OFFICE.

CHARLES S. HISEY, ()F DAYTON, KENTUCKY, ASSIGNOR TO THE HISEY- \VOLFMACHINE CO., OF CINCINNATI, OHIO.

ELECTRIC GRINDING DEVICE.

SPECIFICATION forming part of Letters Patent No. 712,537, dated November4, 1902.

Application filed May 7.1902. Serial No. 106,251. (No model!) To allwhom it may concern:

Be it known that 1, CHARLES S. IIIsnY, a citizen of the United States,and a resident of Dayton, in the county of Campbell and State ofKentucky, haveinvented a certain new and useful Electric GrindingAttachment for Machine-Tools; and I do declare the following to be afull, clear, and exact description thereof, attention being called tothe accompanying two sheets of drawings, with the referencenumeralsmarked thereon, which form also a part of this specification.

This invention relates to certain features and improvements connectedwith electrically-operated grinding-wheels.

The leading feature is the adaptability of the device for use inconnection with machinetools, to which it serves as a grindingattachment, the tool-holding parts of the latter serving to support theattachment, while the work-supporting parts of the particularmachine-tool serve to hold the work to be ground. The grindingattachment, while being so held by the tool-holding device of themachinetool--that is, by the device holding the cutting-tool thereofisthus equally capable of all the adjustments of such cutting-tool and mayalso be detached or placed in position with equal facility as suchcutting-tool or moved from one'maohine for attachment to another.

Other features relate to the construction of the device, as will appearmore fully hereinafter.

In the following specification and particularly pointed out in theclaims following is found a full description of the invention, togetherwith its operation, manner of use, and construction, which latter isalso illustrated in the accompanying two sheets of drawings, in which"Figure 1 is a longitudinal section of the grinding attachment. Fig. 2 isa side elevation of the same. Fig. 3 is a cross-section. Fig. t shows aview of the rear end, where the current is received. Fig. 5 is anotherside view, one showing the device at right angles to the View shown inFig. 2. Fig. 6 shows the front or operative end, where the grindingwheelis located. This view also shows the device attached to the tool-post ofa lathe and used for grinding the rotary cutter of a milling-machine.Figs. 7 and 8, in top views of a lathe, show the attachment at reducedscale and applied to various uses. In the first figure it is used togrind and reshape one of the lathecenters. Fig. 8 shows the device putto the same use as illustrated in Fig. 6. It also shows in dotted linespossibility of the additional use of surface and internal grinding. Theposition of the attachment itself would of course be different at thattime and adapted to such particular use. Fig. 9, in a side view of aplaner, shows still another use of the grinding attachment.

The grinding attachment consists, substantially, of an electric motor,on the armatureshaft 11 of which is mounted the grindingwheel 12, whichmay be the usual emerywheel. The same is detachably held in place by awasher 13 and superposed nut 14 and may be exchanged, the same as in theordinary emery-grinder, with others of different size as to diameter orface, as required. The electrical part of the attachment may be of anyapproved style and does not constitute any part of the invention, exceptto the extent that it may require modification to adapt it to itscombination with the grinding device. 15 indicates the armature thereof16 the field-magnets, and 17 the commutator. The parts are supported ina frame, preferably in shape of a closed housing 18, at opposite ends ofwhich bearings 19 are provided for the armature-shaft 11.. This latterdoes not rest directly in these bearings, however, but in cones 21,fitted on a taper thereinto. This taper is a double onethat is, thelarger part of it is on a fiat angle to form an extendedbearing-surface. Near the outer ends it is more abrupt and forms ashoulder 22, which prevents the cone from slipping in too far, so as towedge. These cones are caused to rotate with shaft 11 by means of pins23, and the object of their use is to take up the wear between thebearingsurfaces of the shaftjournals, which they readily do when drivenfarther in to follow up such wear. A proper support to insure the smoothrunning of the armature-shaft is thus always maintained. The bearingsare closed by dust-caps 2et,which, together with cones 21, are held inposition by nuts at the ends of shaft 11. At one end such is done by nut14, which holds the grindingwheel in place. At the other end a nut 25 isused. One of themit may be the latterserves also as a lock-nut, thelocking feature being obtained by having a split 26 in said nut near oneside of it. A screw 27 passes through this thinner part of the nut andtraversing split 26 is seated in the other part thereof. By turning thisscrew farther into its seat the thread in the thinner part of the nut iscaused to bear with one-sided pressure against the male thread on shaft11 engaged within,thereby preventing the nut from turning voluntarily.

Current to rotate the armature, its shaft, and the grinding-wheelthereon is supplied to the former through commutator 17 by brushes 28,held in contact with the former by spring-pressure, and carried ininsulatingplugs 2.), which are seated in bosses 31, projecting from alateral extension 32 of the housing. 33 represents the wires which carrythe current, connection being made by contacting binding-screws 34. Thebranches necessary for the field are also taken from thesewires insideof the housing, and outside all wires are bunched and twisted into onecable of suitable length which carries at its free end a contact-plug35, constructed the same as the plug of an incandescent lamp. This plugis of standard size to fit the socket of the usual incandescent lamp,the intention being to make connection in this way-that is, by insertingplug 35 into an incandescent-lamp socket. An extra socket may beprovided for such purpose, or one of the lamps may be detached for thetime being and temporary connection tnade. Of course when the positionof the attachment is not changed very often, or not at all, a connectionmore or less permanent may be established. In order to prevent any pullof the wire on bindingscrews 34 during the manipulation of the grinder,the cable is first passed through an opening 36 in the housing, thenopened and spread inside the individual wires, one each passingout againthrough holes 37. Outside they are once more crossed or twisted on eachother before being connected to the bindingscrews 34.

The attachment is held in position by the tool-holding devices of theparticular machine-tool on which itis intendedto be used at the timcas,for instance, by the tool-post 38 of a lathe, as shown in Figs. 6, 7andS, or by the tool-holder or head 39 of a planer, as shown in Fig.9the same as if it were a tool. For such purpose it is provided with ashank 41, having fiat parallel sides and of dimensions equal to theusual lathe or planer-tool, so that. it fits like these and may bereadily connected and clamped in place or detached. It is clear thatafter being so attached the grinder is susceptible of the variousadjustments which the particular tool would be and the place of which istaken now by its shank 41.

Thus, for instance, on the lathe the grinder may bevadjusted in adirection at right angles to the general feed by means of the cross-feeddevice 42 on the carriage 43. Then, again, both are subject tothegeneral adjustment of carriage 43 on the ways or so-called Vs 44 of thelathe-bed.

On the planer the grinder is susceptible of the individual adjustment oftool-head 39, also of the latter on the cross-rail 45, and all of thesedevices by means of rail 45 on the standards or housing 46 in a verticaldirection. The work to be ground is likewise susceptible to themovements of the work-holding devices of these particular machine-toolswhich are, in case of the lathe, the lathe-centers 47 and 48, or a chuck49 and the table 51 in case of the planer.

In Fig. 7 the grinder is used in truing up and repointingthelathe-centeritsclf, which has to be done from time to time on everylathe and no actual work is done. connection the use of my attachment isof great-advantage, since it permitsthe-grinding of these lathe-centerswhile they remain in position on the lathe.

In this In Figs. 6 and 8 a rotary cutter 52 of a milling-machine isbeing ground. This latter is temporarily supported on a mandrel 53, heldbetween the lathe-centers. In this case no parts of the lathe are inoperation,'they,

simply serving as supports for the grinder and the work, which latter ismanipulated by hand. 'Of course in place of cutter 52 other work may bedone which is also held between the lathe-centers, and if required totoo be rotated the head stock or spindle is operated in such case. Workmay also be done on chuck 49, as shown in dotted lines at 54 in Fig. 8,in which case mandrel 53 would of course be removed and thegrinderaccordingly adjusted. For internal; grinding the grinding-wheelis carried at the end of an extension-piece 55, mounted at the end ofshaft 11, as shown in dotted lines in Fig. 8, nut14 and washer 13 havingfirst been removed.

In Fig. 9 the work, whatever it may be, isindicated by 56 and carried onthe planer-table, by which it is reciprocated underneath the grinder.

In such work as shown in Fig. 7, which does not change its position withreference to the grinding-wheel and where there is no progressivefeed-motion or other movement, it becomes necessary to move thegrindingwheel laterally back and forth to reach with IIO the facethereof all parts of the work to be,

ground. For such purpose the part which supports the grinding-wheel t'.6., motorhousing l8is capable of a motion in an axial directionwith'reference to the grindingwheel and independent of theholding-shank41. The constructionwherebythis feature is obtained consists of anintermediate base 57, on one side of which housing 18 isheld in,

a manner to be free for a sliding movement thereon 1n the directionnamed. For such purpose a dovetailed connection is used, thecomplementary engaging parts of which are contained one in said base 57and the other on the outside of housing 18, the thickness of which isaccordingly enlarged at that particular part, as shown at 58. The usualgib 59 is used here to take up the wear and maintain a snug fit betweenthe parts. Shank 41, therefore, does not directly connect to housing 18,such connection being made indirectly by means of the intermediate base57, to the other side of which said shank attaches. For so movinghousing 18 a screw 61 is used which may be seated in either one of theparts and has no longitudinal movement. As shown, it is seated in base57 and provided with an operating-handle 62 for rotation.

The thread of it projects beyond base 57, so as to be in contact withthe contiguous outer surface of the enlarged part 58 of housing 18. Thissurface contains the complementary female thread 63, (see Figs. 1 and5,) engaged by screw 61, and whereby the desired movement back and forthof the grinding-wheel is readily obtained.

In addition to all the previously-described possible adjustments of thegrinding attachment as a whole on the particular tool-holder and bymeans of the same there is an additional adjustment possible of thedevice on its shank and in a rotary direction thereon and with saidshank as a center. The possibility of this adjustment is shown in dottedlines in Fig. 5, and byit the range of this device to suit variousshapes and positions of workis still more extended. Forsueh purpose theend of shank 41 is round and fitted into the socket-hole of a boss 6-1on base 57, which permits one part to turn on the other. Afteradjustment the parts may be heldin position by a set-screw or any othersuitable locking device. As shown, I use a nut 65, occupying a socket613, and which socket communicates with the socket for the end of shank41, so that said nut may come in contact with said shank.Theextentofthiscontactisiucreased by cutting off a corner of said nut,asshown. Forlocking the parts ascrew 67 is used to draw this nut tightlyagainst the end of shank 41.

For grinding toothed or serrated work, like milling-machine cutters orreamers, &c., a rest and indexing attachment is provided to insure acorrect and even grinding of all the teeth. This device consists of therest 68, against the upper end of which the teeth are intended to rest,one after the other. Figs. 6 and 8 illustrate the manipulation. Afterone tooth is ground the cutter is slid laterally on the supportingmandrel 53, then sufficiently turned and slid back again, so that thenext tooth comes to bear on the rest. The position of this latter, aswell as mandrel 53, and the grinding-wheel being fixed it is clear thatall teeth will be ground to the same extent. For its adjustment rest 68is carried on an arm (39, which latter is carried on another arm 71.Each one of these has a screwclamp 72 on one of its ends to engage eachother and rest 68, the position being secured in each case by screws 73.Arm 71 is supported in a boss 74, projecting from housing 18 andadjust-ably held therein by means of a set-screw 75.

As will be seen, this grinding attachment may be adjusted with thetool-holding device of the particular machine to which it is attached tooperate in any position which this former is capable of assuming, thuspresenting possibilities of an independent grindingmachine withoutrequiring the various supports and many complicated parts which arenecessary in such machines.

Having described my invention, I claim as new 1. In an electricattachment for machinetools, the combination of an electric motor, acylindrical housing for it having part of its side increased inthickness to form the com plementary part of a dovetail connection, abase which contains and receives the other complementary part of suchconnection and on which the motor-housing is mounted in a manner to havea sliding movement, a screw mounted in this base in alongitudinally-fixed position and projecting with part of its peripherybeyond the contiguous part of the dovetail connection of the base, acorresponding partial female thread in the other contiguous part of thedovetail connection on the housing which receives and is engaged by saidscrew, a rectangular shank projecting from the base and of dimensionsfitted to be received by the tool-holder of a machine-tool to detachablyconnect and support the grinding attachment, an armature-shaft supportedin the motor-housing,a grinding-wheel mounted on one of its ends andmeans to connect the motor with a source of current.

2. In an electric grinding device, the combination of an electric motor,a housing for it, an armature-shaft, bearings for it in the housing, agrinding-wheel mounted on one of its ends, nuts, one at each end of theshaft to hold the same in position, one being partly split and slottedin a direction at right angles to its axis, a screw 27 whereby the twoparts of this nut may be drawn together to cause them to bind withunequal pressure against the inclosed male thread of shaft 11, therebylocking said nut against voluntary rotation, a shank fitted forattachment to the tool-holder of a machine-tool to support the entiredevice and means to connect the motor with a source of current.

3. In an electric attachment for machinetools, the combination of anelectric motor, a housing for it, an armature-shaft, bearings for it inthe housing, a grinding-wheel mounted on one of its ends, a base on oneside of which the motor-housing is mounted with a dovetailed connectionand in a manner to be capable of a sliding adjustment thereon, a boss64: projecting from the other side of this same base and provided with asocket, a rectangular shank, the round end of. which is received by thissocket so as to permit rotary ad 11stment of the base on said shank, theprojecting part of which is fitted to be received by the tool-holder ofa machine-tool to detachably connect and support the grindingattachment, a socket 66 in boss 64 communicating with the shank-sockettherein, a lock-nut 65 in socket 66, a screw 67 whereby said lock-nutmay be drawn into locking contact with the round end of theholding-shank and means to connect the motor withia source of current.

4. In an electric attachment for machinetools, the combination of anelectric motor, a housingfor it, an armature-shaft, bearings for it inthe housing, a grinding-wheel mounted on one of its ends, anindexing-rest 68 projecting from the motor-housing to support toothedwork, means'whereby the same is supported on the motor-housing in amanner to be adjustable with reference to the grindingwheel, arectangular shank of dimensions fitted to be received by thetool-holderot' a machine-tool to detachably connect and support theentire device and means to connect the motor with a source of current.

ed in a manner to render rest 68 adjustable with reference to thegrinding-wheel, a rectangular shank of dimensions fitted to be receivedby the tool-holder of a machine-tool to detachably connect and supportthe entire I device and means to connect the motor with a source ofcurrent.

In testimony whereof I hereunto set my signature in the presence of twowitnesses.

CHARLES S. HISEY.

Witnesses:

G. SPENGEL, ARTHUR KLINE.

